Move more tests to faster Mac11 machines.

I'm still attempting to tune the sharding and timeouts for our
Mac11 capacity, and it looks like unit_tests and content_unittests
are too slow to run on the "slow" Mac11 machines (the so-called
'n1-highcpu-4' machine type, which is actually one-third the
speed of the 'n1-standard-4' machine type).

So, this CL moves them over to run on the faster machines.

Bug: 1206401
Change-Id: I5b33823892d14f5100e3d2c06f7f5170d4004992
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2878107
Reviewed-by: Gary Tong <[email protected]>
Commit-Queue: Dirk Pranke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#880512}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 9bb3df0..de87062 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1440,6 +1440,17 @@
           'shards': 2,
         },
       },
+      'Mac11 Tests': {
+        # TODO(crbug.com/1206401): Restore to defaults when there is enough
+        # capacity.
+        'swarming': {
+          'dimension_sets': [
+            {
+              'machine_type': 'n1-standard-4',
+            },
+          ],
+        },
+      },
       'fuchsia-code-coverage': {
         'swarming': {
           'shards': 12,
@@ -2958,6 +2969,17 @@
           'shards': 2,
         },
       },
+      'Mac11 Tests': {
+        # TODO(crbug.com/1206401): Restore to defaults when there is enough
+        # capacity.
+        'swarming': {
+          'dimension_sets': [
+            {
+              'machine_type': 'n1-standard-4',
+            },
+          ],
+        },
+      },
       'ToTLinuxASan': {
         'swarming': {
           'shards': 2,